Latitudinal beaming and local time effects in the decametre-wave radiation from Jupiter observed at the earth and from Voyager

Astronomy and Astrophysics – Astronomy

Scientific paper

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Decametric Waves, Jupiter Atmosphere, Planetary Radiation, Radio Astronomy, Temporal Distribution, Voyager Project, Atmospheric Attenuation, Histograms, Ionospheric Propagation, Statistical Analysis, Jupiter, Beaming, Latitude, Radiation, Decameter Waves, Wavelengths, Earth-Based Observations, Voyager 1, Frequencies, Pra, Characteristics, Planetary Radio Astronomy Experiment, Emissions, Comparisons, Data, Io, Ionosphere, Source Medium, Intensity, Absorption, Satellites, Sun

Scientific paper

Occurrence probabilities and frequency characteristics of decameter-wave Jovian sources computed from over 20 years of earth observations were used as a guide for comparing short periods of simultaneous earth-based observations with the decametric observations made by Voyager 1 during the 30-day periods preceding and following encounter. The results have been assessed with respect to possible Jovian local time effects and latitudinal beaming, and the effects of terrestrial ionospheric absorption have been considered in relation to characteristic decametric source intensities and frequency ranges. Both Voyager and ground-based observations confirm that a linear relation exists between the position, in central meridian longitude, of the center of the Non-Io A source and Jovigraphic latitude.

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